<template>
  <el-table :data="formatData" :row-style="showRow" v-bind="$attrs">
    <el-table-column v-if="columns.length === 0" width="150">
      <template slot-scope="scope">
       <span
         v-for="space in scope.row._level"
         :key="space"
         class="ms-tree-space"
       ></span>
        <span
          v-if="iconShow(0, scope.row)"
          class="tree-ctrl"
          @click="toggleExpanded(scope.$index)"
        >
         <i v-if="!scope.row._expanded" class="el-icon-plus"></i>
         <i v-else class="el-icon-minus"></i>
       </span>
        {{ scope.$index }}
      </template>
    </el-table-column>
    <el-table-column
      v-for="(column, index) in columns"
      v-else
      :key="column.value"
      :label="column.text"
      :width="column.width"
    >
      <template slot-scope="scope">
       <span v-if="index === 0">
         <span
           v-for="space in scope.row._level"
           :key="space"
           class="ms-tree-space"
         ></span>
       </span>
        <span
          v-if="iconShow(index, scope.row)"
          class="tree-ctrl"
          @click="toggleExpanded(scope.$index)"
        >
         <i v-if="!scope.row._expanded" class="el-icon-plus"></i>
         <i v-else class="el-icon-minus"></i>
       </span>
        {{ scope.row[column.value] }}
      </template>
    </el-table-column>
    <el-table-column
      align="center"
      width="300"
      label="操作">
      <template slot-scope="scope">
        <el-button type="text" @click="itemClick(scope.row,1)">查看</el-button>
        <el-button type="text" @click="itemClick(scope.row,2)">设置</el-button>
        <el-button type="text" @click="itemClick(scope.row,3)">添加子机构</el-button>
      </template>
    </el-table-column>
    <slot />
  </el-table>
</template>

<script>
  import treeToArray from "@/views/dept/eval.js";
  export default {
    name: "TreeTable",
    props: {
      /* eslint-disable */
      data: {
        type: [Array, Object],
        required: true
      },
      columns: {
        type: Array,
        default: () => []
      },
      evalFunc: Function,
      evalArgs: Array,
      expandAll: {
        type: Boolean,
        default: false
      }
    },
    computed: {
      // 格式化数据源
      formatData: function() {
        let tmp;
        if (!Array.isArray(this.data)) {
          tmp = [this.data];
        } else {
          tmp = this.data;
        }
        const func = this.evalFunc || treeToArray;
        const args = this.evalArgs
          ? Array.concat([tmp, this.expandAll], this.evalArgs)
          : [tmp, this.expandAll];
        return func.apply(null, args);
      }
    },
    methods: {
      itemClick: function(row,value){
        this.$emit('parnet-click',row,value);
      },
      showRow: function(row) {
        const show = row.row.parent
          ? row.row.parent._expanded && row.row.parent._show
          : true;
        row.row._show = show;
        return show
          ? {animation:"treeTableShow 1s;-webkit-animation:treeTableShow 1s"}
          :
          {
            display:"none"
          }
      },
      // 切换下级是否展开
      toggleExpanded: function(trIndex) {
        const record = this.formatData[trIndex];
        record._expanded = !record._expanded;
      },
      // 图标显示
      iconShow(index, record) {
        return index === 0 && record.children && record.children.length > 0;
      }
    }
  };
</script>
<style rel="stylesheet/css">
  @keyframes treeTableShow {
    from {
      opacity: 0;
    }
    to {
      opacity: 1;
    }
  }
  @-webkit-keyframes treeTableShow {
    from {
      opacity: 0;
    }
    to {
      opacity: 1;
    }
  }
</style>

<style lang="scss" scoped>
  $color-blue: #2196F3;
  $space-width: 18px;
  .ms-tree-space {
    position: relative;
    top: 1px;
    display: inline-block;
    font-style: normal;
    font-weight: 400;
    line-height: 1;
    width: 18px;
    height: 14px;
  }
  .ms-tree-space::before {
    content: "";
  }
  .processContainer {
    width: 100%;
    height: 100%;
  }
  table td {
    line-height: 26px;
  }
  .tree-ctrl {
    position: relative;
    cursor: pointer;
    color: $color-blue;
    margin-left: -$space-width;
  }
</style>
